Concrete block



1. Concrete block

1.1 is a front elevation view of a concrete block showing my new design;

1.2 is a top plan view thereof;

1.3 is a left side elevation view thereof;

1.4 is a right side elevation view thereof;

1.5 is a bottom plan view thereof;

1.6 is a perspective view thereof; and

1.7 is a perspective view taken from an alternate position. 

CLAIM The ornamental design for a concrete block, as shown and described. 